Abstract: This paper presents a developmental platform for the agriculture expert system based on the 3G/Smartphone technology.DepAes, applying the dichotomous reasoning method, could be used for the development of expert information and mathematical mode1s by searching for nodes within dichotomous trees of the data-structure.It was designed to be a generalized platform for agricultural professionals to develop their own multimedia expert systems.DepAes was friendly for data entry, simple in operation, and open for sharing.Therefore, it should be useful for the development of agricultural informatization.As the demand for mobile communications grows constantly, the Smartphone and 3G mobile technologies were deemed to be adapted for the agriculture mobile information processing and mobile computing as well.Establishment of DepAes platform would facilitate such development.